Quarterly report pursuant to Section 13 or 15(d)

Variable Interest Entities (Consolidated and Unconsolidated) (Details)

v3.2.0.727
Variable Interest Entities (Consolidated and Unconsolidated) (Details) - USD ($)
 3 Months Ended 6 Months Ended 12 Months Ended
Jun. 30, 2015
Jun. 30, 2014
Mar. 31, 2013
Mar. 31, 2012
Sep. 30, 2011
Jun. 30, 2015
Jun. 30, 2014
Dec. 31, 2014
Mar. 31, 2015
Mar. 31, 2014
Dec. 31, 2013
Assets                      
Cash $ 1,379,969,000         $ 1,379,969,000   $ 1,220,565,000      
Loans and leases 48,752,301,000         48,752,301,000   47,655,726,000      
Allowance for loan and lease losses (599,542,000) $ (635,101,000)       (599,542,000) $ (635,101,000) (605,196,000) $ (605,126,000) $ (631,918,000) $ (647,870,000)
Net loans and leases 48,152,759,000         48,152,759,000   47,050,530,000      
Accrued income and other assets 1,983,143,000         1,983,143,000   1,807,208,000      
Total assets 68,845,648,000         68,845,648,000   66,298,010,000      
Liabilities                      
Long-term borrowings 5,854,584,000         5,854,584,000   4,335,962,000      
Accrued interest and other liabilities 1,510,183,000         1,510,183,000   1,504,626,000      
Total liabilities $ 62,349,390,000         62,349,390,000   59,969,840,000      
Variable Interest Entities (Textuals) [Abstract]                      
Maximum year to defer payment of interest on debenture not exceeding five years                    
Net sales of Low Income Housing Tax Credit Partnership investments           0          
Gain (loss) on net sales of Low Income Housing Tax Credit Partnership investments           0          
Total of automobile loans transferred in securitization transactions     $ 800,000,000 $ 1,300,000,000 $ 1,000,000,000            
Impairment Losses On Tax Credit Investments $ 0 0       0 0        
Consolidated Trusts [Member]                      
Assets                      
Cash 0         0   0      
Loans and leases 260,438,000         260,438,000   0      
Allowance for loan and lease losses 0         0   0      
Net loans and leases 260,438,000         260,438,000   0      
Accrued income and other assets 229,000         229,000   243,000      
Total assets 260,667,000         260,667,000   243,000      
Liabilities                      
Long-term borrowings 219,099,000         219,099,000   0      
Accrued interest and other liabilities 229,000         229,000   243,000      
Total liabilities 219,328,000         219,328,000   243,000      
Equity                      
Beneficial interest owned by third party 41,339,000         41,339,000   0      
Franklin 2009 Trust [Member]                      
Assets                      
Cash 0         0   0      
Loans and leases 0         0   0      
Allowance for loan and lease losses 0         0   0      
Net loans and leases 0         0   0      
Accrued income and other assets 229,000         229,000   243,000      
Total assets 229,000         229,000   243,000      
Liabilities                      
Long-term borrowings 0         0   0      
Accrued interest and other liabilities 229,000         229,000   243,000      
Total liabilities 229,000         229,000   243,000      
Equity                      
Beneficial interest owned by third party 0         0   0      
Huntington Technology Funding Trust Series 2012A [Member]                      
Assets                      
Cash 0         0          
Loans and leases 50,844,000         50,844,000          
Allowance for loan and lease losses 0         0          
Net loans and leases 50,844,000         50,844,000          
Accrued income and other assets 0         0          
Total assets 50,844,000         50,844,000          
Liabilities                      
Long-term borrowings 42,103,000         42,103,000          
Accrued interest and other liabilities 0         0          
Total liabilities 42,103,000         42,103,000          
Equity                      
Beneficial interest owned by third party 8,741,000         8,741,000          
Huntington Technology Funding Trust Series 2014A [Member]                      
Assets                      
Cash 0         0          
Loans and leases 209,594,000         209,594,000          
Allowance for loan and lease losses 0         0          
Net loans and leases 209,594,000         209,594,000          
Accrued income and other assets 0         0          
Total assets 209,594,000         209,594,000          
Liabilities                      
Long-term borrowings 176,996,000         176,996,000          
Accrued interest and other liabilities 0         0          
Total liabilities 176,996,000         176,996,000          
Equity                      
Beneficial interest owned by third party 32,598,000         32,598,000          
Unconsolidated Trusts [Member]                      
Carrying amount and classification of unconsolidated trusts assets and liabilities                      
Total assets 545,071,000         545,071,000   527,513,000      
Total liabilities 582,050,000         582,050,000   557,696,000      
Maximum exposure to loss 531,152,000         531,152,000   513,594,000      
Trust Preferred Securities Total [Member]                      
Carrying amount and classification of unconsolidated trusts assets and liabilities                      
Total assets 13,919,000         13,919,000   13,919,000      
Total liabilities 317,090,000         317,090,000   317,075,000      
Maximum exposure to loss 0         0   0      
2015-1 Automobile Trust [Member]                      
Carrying amount and classification of unconsolidated trusts assets and liabilities                      
Total assets 10,838,000         10,838,000          
Total liabilities 0         0          
Maximum exposure to loss 10,838,000         10,838,000          
2012-2 Automobile Trust [Member]                      
Carrying amount and classification of unconsolidated trusts assets and liabilities                      
Total assets 1,836,000         1,836,000   3,220,000      
Total liabilities 0         0   0      
Maximum exposure to loss 1,836,000         1,836,000   3,220,000      
2012-1 Automobile Trust [Member]                      
Carrying amount and classification of unconsolidated trusts assets and liabilities                      
Total assets 895,000         895,000   2,136,000      
Total liabilities 0         0   0      
Maximum exposure to loss 895,000         895,000   2,136,000      
2011 Automobile Trust [Member]                      
Carrying amount and classification of unconsolidated trusts assets and liabilities                      
Total assets 386,000         386,000   944,000      
Total liabilities 0         0   0      
Maximum exposure to loss 386,000         386,000   944,000      
Tower Hill Securities [Member]                      
Carrying amount and classification of unconsolidated trusts assets and liabilities                      
Total assets 46,688,000         46,688,000   55,611,000      
Total liabilities 65,000,000         65,000,000   65,000,000      
Maximum exposure to loss 46,688,000         46,688,000   55,611,000      
Low Income Housing Tax Credit Partnerships [Member]                      
Carrying amount and classification of unconsolidated trusts assets and liabilities                      
Total assets 397,297,000         397,297,000   368,283,000      
Total liabilities 174,573,000         174,573,000   154,861,000      
Maximum exposure to loss 397,297,000         397,297,000   368,283,000      
Affortable Housing Tax Credit Investments [Abstract]                      
Affordable housing tax credit investments 625,465,000         625,465,000   576,381,000      
Amortization 228,167,000             208,098,000      
Net affordable housing tax credit investments 397,298,000         397,298,000   368,283,000      
Unfunded commitments 174,573,000         174,573,000   154,861,000      
Tax credits and other tax benefits recognized 14,434,000 13,744,000       30,181,000 28,061,000        
Proportional Amortization Method [Member]                      
Affortable Housing Tax Credit Investments [Abstract]                      
Tax Credit Amortization Expense 11,218,000 9,518,000       22,292,000 18,877,000        
Equity Method [Member]                      
Affortable Housing Tax Credit Investments [Abstract]                      
Tax Credit Investment Losses 147,000 $ 223,000       294,000 $ 446,000        
Other investments                      
Carrying amount and classification of unconsolidated trusts assets and liabilities                      
Total assets 84,050,000         84,050,000   83,400,000      
Total liabilities 25,387,000         25,387,000   20,760,000      
Maximum exposure to loss $ 84,050,000         $ 84,050,000   $ 83,400,000